implantation bleeding?

Brianna • 26. Married. Happy. TTC #1. 1 miscarriage, 3 failed IUIs. Male factor infertility. Starting IVF Summer 2020. Foster mama.
So I'm about 5 days from my expected period and I had some very very light pink blood on the tissue when I wiped after the bathroom yesterday. I went to bed and I didn't bleed at all and then I went to the bathroom again and sure enough very very very twinge of light pink blood today too. I put a panty liner in but nothing is coming out. 
Do you think this could be implantation? I have never spotted during my cycle before. 
Any opinions?